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General Catalogue
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A Selected and Annotated Bibliography of Pitch Pine (Pinus Rigida Mill.)
S2The authors have attempted to include in this bibliography all articles that contain significant original information about pitch pine or that are comprehensive review; Secondary sources, such as textbooks that briefly review the literature on specific subjects, are omitted. Articles on local floras are included only if they provide new, revised, or more detailed information about the distribution or abundance of pitch pine.S3.
Some Effects of Paraformaldehyde on Wood Surrounding Tapholes in Sugar Maple Trees
S2Pills of paraformaldehyde (trioxymethylene) are commonly used in tapholes in sugar maple trees (Acer saccharum Marsh.) to increase the yield of sap collected for making syrup and sugar (2, 4, 5, 8). The explanation offered for this increase in sap yield is that microorganisms in the tapholes (7) cause premature decline and stoppage of the sap flow (1, 6), but that paraformaldehyde increases sap yield by inhibiting their growth (2). But what happens to the tree? To determine the effects of paraformaldehyde on the tissues surrounding tapholes, and on the microorganisms in those tissues, sugar maple trees were dissected and studied. This paper is a report on that study.S3.
Ferns of the Vicinity of New York
90 species of true fern allies covered in detail. 85 full-page drawings, 13 keys, etc.
A Selected Guide to the Literature of the Flowering Plants of Mexico
This bibliography is a guide to the literature on Mexican flowering plants, beginning with the days of the discovery and conquest of Mexico by the Spaniards in the early sixteenth century.
